package com.lk.user.interceptor;


import com.lk.user.domain.Logininfo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import java.util.Objects;
@Service
public class LoginInterceptor implements HandlerInterceptor {

    @Autowired
    private RedisTemplate redisTemplate;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("token");
        if (StringUtils.isNotBlank(token)){
            //根据token查询redis中的登录信息
            Logininfo logininfo=(Logininfo) redisTemplate.opsForValue().get(token);

            //存在放行
            if (Objects.nonNull(logininfo)){
                return true;
            }
        }
        //token为空，提示未登录
        response.setCharacterEncoding("utf-8");
        response.setContentType("application/json; charset=UTF-8");
        PrintWriter writer = response.getWriter();
        // 在外面写好在拷贝进去
        writer.write("{\"success\":false,\"message\":\"noLogin\"}");
        writer.close();
        return false;
    }
}
